Garmin Calories Burnt Accuracy

Hey all! First time poster here.

So, I have been happily plodding along with my Garmin Forerunner 110 for a few years and I finally decided it was time for an upgrade. It's a nifty device but I'm a bit confused by the massive discrepancy between calories burnt on it. I ran 9.5 miles today and it told me I'd only burnt off 514 cals, whereas on a 10 mile run with my old watch it was about 760. I'm 5"1 and 98lbs so I can imagine I don't use tons of energy but still 514 seems quite low?

I like to have an accurate estimate so I make sure I'm eating enough to keep me fuelled and ready for my next run so I'm a bit annoyed that I'm now completely clueless as to which is right!

Anyone have any experience of the Garmin or other GPS/Heart rate monitor devices? Would be a big help image

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